1、High Light Transmittance: The filter is covered with optical film, waterproof film and high permeability coating; high hardness and light transmittance, will not affect the shooting effect. 2、Help Correct Color: Waterproof case dive filter can help correct color when using action cameras for diving photography, providing you great using experience. 3、Applicable Scenes: Dive filter is suitable for extreme outdoor activities, deep water diving, surfing, snorkeling and other water sports activities. 4、Good Workmanship: Dive filter is made of ABS and acrylic material. Exquisite workmanship, beautiful appearance design, small portable size. 5、Filter Function: This filter is specially designed for seawater diving photography, suitable for Hero 8 9, highly compatible, to meet different photography needs.